Elbow and forearm Flashcards
Concentric actions of the biceps brachii
Elbow flexion, and forearm supination
Concentric action of the brachialis and brachioradialis
Elbow flexion
Concentric action of the pronator teres and pronator quadratus
Forearm pronation
Concentric action of the triceps
Elbow extension
Concentric action of the Anconeus
Elbow extension
Concentric action of the supinator
Supination
The elbow joint can be thought of as two interrelated joints: the
ulnohumeral and radiohumeral joints
The articulations between the radius and ulna are often referred to as the…
forearm
* Proximal radioulnar joint
* Distal radioulnar joint
What are superior to the medial and lateral epicondyles of the humerus
The medial and lateral ridges supracondylar formed between the diaphysis and epicondyles
Where is the capitulum
The smooth round articular surface just distal to the lateral epicondyle
Where is the trochlea
The smooth spool shaped articular surface located medial to the capitulum
Where is the coranoid fossa
Located on the anterior humerus between the medial and lateral epicondyles
Where is the radial fossa
Located lateral to the coronoid fossa on the anterior humerus
Where is the trochlear notch
The large C-shaped notch in the proximal end of the ulna
The trochlear notch articulates with the trochlea of the humerus
Where is the coranoid process
The small triangular shaped process on the very anterior portion of the
trochlear notch
Where is the radial notch
The notch just lateral to the coronoid process
Ulnohumeral joint articulating bones
Trochlea of the humerus and trochlear notch of the ulna
Ulnohumeral joint Diarthrodial joint subdivision
Uniaxial, hinge type synovial jointR
Radiohumeral joint articulating bones
Head of the radius and Capitulum of the humerus
Radiohumeral diarthrodial joint subdivision
We will go with biaxial combined hinge and pivot type synovial joint
Function of the ulnar (medial) collateral ligament
Critical in providing medial (valgus) stability to the elbow joint by limiting abduction of the elbow joint
Function of the radial (lateral) collateral ligament
Provides lateral (varus) stability to the elbow joint
Limits adduction of the elbow joint
What kind of sports is the ulnar collateral ligament usually injured in, and what is the surgery named with a torn UCL?
The ulnar collateral ligament is commonly injured in overhead
throwing sports (e.g. baseball)
* The anterior band is the most commonly injured band
* The surgery associated with torn UCL is the “Tommy John” surgery that
you hear a lot about in baseball, especially in pitchers
What is the most common injury associated with RCL tears
The radial collateral ligament is not commonly injured. If it is injured, it is
usually associated with an elbow dislocation
Proximal radioulnar joint articulating bones
Head of the radius and Radial notch on the ulna
Prox radioulnar joint Diarthrodial joint subdivision
Uniaxial, pivot type synovial joint
Annular ligament function
Holds the head of the radius in the radial notch of the ulna
Interosseous membrane function
It runs between the radius and ulna and Holds the two structures together
Transmits force from the hand to the two bones
Distal radioulnar joint articulating bones
Ulnar notch on the radius and the The round head of the ulna
Distal radioulnar joint Diarthrodial joint subdivision
Uniaxial, pivot type synovial joint
2 ligaments of the distal radioulnar joint
Dorsal (posterior side of the forearm) radioulnar
Volar (anterior side of the forearm) radioulnar ligaments
